Anyone experienced in helping SEN children - toilet refusal

[JalapenoCheeseOnToast]

Hi all,

Hope this is okay to post, please direct me if not!

I'm doing my HLTA training and part of it is to spend time planning and carrying out an intervention for an SEN child. I am most interested in the nurture side of intervention as we are heavily focused on maths and reading as a school already. I have identified a child who has ASD and who had fear of using the toilet - as such, they withhold at school and are off frequently due to the health consequences of withholding. I'd like to start an intervention based on building confidence with them - I'm under no illusion that I'll solve the toileting issue! But I think perhaps some techniques and work into building confidence could be beneficial to them.

My question is: has anyone dealt with a situation like this before or run a similar intervention? I've had a look at toileting issues in autistic children but it seems very geared towards toilet training rather than toilet fear. I've also taken a look into materials regarding building confidence for ASD children but I just wanted to know if anyone had any recommendations of where I could also look or reading that would be beneficial to me!

Thanks so much in advance!

Just to add! The child and I are in UKS2

Ok I've experienced this on several occasions. Things that have helped:
If a parent is willing, get them to use the toilet them self in school a few times when they collect or drop the child.
Social story around using the toilet including taking and using photos of the actual toilet they'll be going to.
Identifying the root cause of the problem, too noisy, fear of other children bursting in, not quite knowing what to do (where is toilet roll etc) hand driers, unfamiliar toilet paper.
Identifying a toilet that they can use that minimises stress.
Eg one with a full door, no hand dryer, not used by other children.
A graduated reward based approach so they get rewards for a week for touching the toilet door, then build towards standing in the toilet cubicle, sitting on the toilet fully clothed then eventually using the toilet.
Taking a favoured or safe object into the toilet cubicle with them.
Staying back at the end of the day and using the toilet when nobody else is around .
Giving them a visual to ask to go to the toilet and a visual timetable showing them where toilet breaks could happen. Even if they're fully verbal done children can experience severe anxiety around asking to go to the toilet or identifying the right time.
Taking them into the general area of the toilet for non-threatening reasons so they get used to the smell of it. EG filling paint pots with water or getting a tissue.
Experimenting with different scents to see which they respond well to then keeping a bottle of that handy to spray before they go in.
Meet with parents and take notes about their toilet routine at home and try to recreate it as far as possible at school.
Good luck, it's a tricky issue to crack but definitely worth giving it a go.